Method and apparatus for making sheet-glass.



E W. cmLBuRm. A METHOD AND APPARATUS 'FOR MAKING SHEET GLASS.

APPLICATION FILED IAN. 8| l9l6- A .Patenwd Dec 4,1911.

Z SHEETS-SHEET WWW MWW' a. W. COLBURN.

METHOD AND APPARATUS FOR MAKING SHEET GLASS.

APPLICATION FILED JAN. 8. I9l6.

' Patented Men. 4,191?

ZSHIEETS-8HEET 2- [717677 tar I. W. COLBURIL' METHOD AND APPARATUS FOR MAKING SHEET GLASS.

APPLlCATlON FILED JAN. 8. I916.

Patented Dec. 4, 191 7.

TSHEETS-SHEET 3 H QQM J [/2 7 27 far 7 MW W W M ,%\l m w. COLBURN. METHOD AND APPARATUS FOR MAKING SHEET GLASS.

7 SHEETS-SHEET 4- [raven far "fir Zn; WCUZZ 7/777 r? Wm M hm .l. W. COLBURN.

METHOD AND APPARATUS FOR MAKING SHEET GLASS.

7 SHEETS-SHEET 5- ammo p frn zruj 6M @oWawrn/ mm yam a QW S l. W. COLBURN.

METHOD AND APPARATUS FOR MAKING SHEET GLASS.

APPLlCATION FILED JAN. 8. 1916.

' Patented Dem 4, 191?.

7 SHEETS-SHEET 6- i V snow/wow 19/270? 6(/ 60/6007 AMA-g m Qua/mugs i l. W. COLBURN.

METHOD AND APPARATUS FOR MAKING SHEET GLASS.

APPLICATION FILED IAN. 8.1916.

Patented; Dec. 4,19]?

'7 SHEETS-SHEET 7- @31 mm A M Mum which the following naaaeoe.

PATET 1 m riad w. connnnn', or 'roLnno, OHIO, essrenon zro rnn tronnno or ronnno, onro, a oonronerion' or 011110. a

" Application filed January a, rare. ser al no. renew.

To all wiiom it may concern:

Be it'known that LJBWING W. Corpsman, a citizen of the United States of America, residing at Tzoledo, in the county of Lucas and State of Ohio, .have invented certain new and useful Improvements in Methods and'Apparatus for Making Sheet-Glass, of

is a specification, reference being had therein to the accompanying drawings. I I

he invention consists in a method and an apparatus for making sheet glass by continuously drawing a sheet from a supply of molten glass, and particularly in .im

proveinents whereby the sheet may be drawn clear, flat and free from abrasive marks or mar-ring, whereby a fine quality of glass is produced, as more fully hereinafter set forth and particularly pointedout in'the claims.

In the drawings: Figure 1 is a vertical, central, 1ongltudi nal section through a glass drawing appaof the air and ra'tus embodying my invention; I

Fig. 2 is a side elevation thereof, showing the drawing mechanism, parts being broken away and parts in section,

nism andshowing the construction of the v glass tank;

Fig. as a sectional elevation of the bending roll and connections, together with the cooling device below the same;

Fig. 5 is an elevation, partly in section,

water connection to the bendin roll;

ig. 6 is a section throu' h mechanism for the drawing tafile';

. Fig. 7 is a section on line :v-'w of Fig. 6;

Fig. 8 is a front elevation of the reverse lever and eonnections; y j-" Fig. 9 is a side elevation thereof, with parts of the casing in section Fig. 10 'is'a side elevation of gear casing and mechanism;

Fig. 11 is a lan view of-en'e of the knurled rolls used at theed e of the sheet;

Fig. 12 is an end elevation of those-rolls, showing the relation. ofthe glass thereto during the drawing operation Fig. 13 is an enlarged elevation of one end of the drawing table, to illustrate more clearly than can be illustrated in the small the drive the reverse Specification of Letters Patent.

o the water supply pipes being omitted to enable the drawing vvhich in the use of the device nnrnon AND nrrnna'rus run Mannie snnnr-enass.

Patented nee. a, let '3...

drawing of Fig. 1 the manner of flattening the sheet upon the table before the clamping means are applied thereto; and

Fig.14 is a section through the drawing. table and clamping bars, showing the glass sheet between, as in the process of drawing;

The method and apparatus herein shown constitute an improvement 11 on the method i and apparatus shown and prior patents, such, for instance, as in Patents Nos. 966,652 and 1,122,692, and in Patent 876,267., to E. Washburn and myself; and renders certain the obtaining of sheet glass free'from marring by the drawing apparatus, and perfectly flat, that is, free from;

undulations or waves.

escribed in my 1 represents the continuous tank in which the'batch is melted and from which it flows into the coolingtank, 2, this cooling tank being shallower than the melting tank. At the forward end of the cooling tank is a drawing tank, 3, preferably made of a tile substantially trough shaped in cross sec- 16, separates. this'section of p the roof from the section 7 thereof at a less height. Be-

sides the arch 6 and through the roof 7 I show avertically adjustable gate, 8, which ma be raised and lowered to let more or les heat from the chamber in the melting tank into the cooling chamber.

In theroof 7- I also show an opening, 9., i

which may be more or less open or closed by means of a tile or brick, 10, to also control the temperature in the cooling chamber.

12 are suitable openings in the side-walls, may be bricked up but which may be opened for access to the interior of the tanks.

At the forward end ofthe cooling tank and above the level of the glass therein is an arch, 14, preferably provided with a cooling passage, 15.

The drawing tank 3 is supported on the walls 15 of a heating :chamber, 16, into; which gaseous flame is ordinarily directed,

suitable passage-ways for the flame being provided,--and at the end of the heating chamber is an outlet flue, 17

At the outer ad of the drawing tank I have shown the cover tile, 18, extending inwardly and having the depending]. lip, 19, extending down in proximity to t e glass;

this tile being spaced from the top of the drawingtank to leave a passage into the outlet fli1e,f'1'7 .20 indicatinga burner for directing the gas flame into the space beneath this tile and above the level of the glass in the drawing tank. At the other end of.

the drawing tank I provide a curtain--tile,-' f

21, which I have shown as supported the crossbar,- 22, byhooked engagement between the two members.

glass in the drawingtank maybe drawn. I

- 2o draft-applying chamber .30 formed by the 7 walls 31 and the roof, 32 This draft-apply- 'point.

Beyond shields, 22, on opposite sides of the drawing the end of the drawing tank is a ing chamber at its farther end connects with 4 v the leer chamber 32, of which 33 is the roof tank, from which the sheet is taken, and as j as this is merely a space with a roof over it, in which the vertical portion of the drawn sheet extends, I call this space, 36, the draw-.

ing-shaft or. well.

The roof 32 extends over the drawingshaft and a heating chamber 37 is formed above the same, within the'side-walls, 31, which are extended, as shown, to meet the arch 14, The heatlng chamber 37 has its bottom formed by a cross-bar, 38, and tile cover, 39, therefor and a bottom tile, 40. I

have shown the heat therefor supplied from a burner, 41, in a chamber, 42, there being an apertured wall 43 between the chambers 37 and 42. The bottom of the chamber 42 is formed by a horizontal partition, 44, and below this is formed another heating chamber, 45, having a front perforated wall, 46,

and a bottom tile, 47. t

The draft-applying mechanism in the chamber 30 comprises an endless drawing shafts 52 and 53. The drawing portion oftable, 50, composed of links connected by suitable cross-rods, said table passing over sprocket-wheels, 51, which are upon crossthis table rests upon a guide-way,.54, supported on cross-bars, 55, the guide way having slightly inclined ends, 56. Above this drawing table are cross-shafts, 57, 58, having thereon sprocket wheels, 59, overv which pass two oppositely disposed endless chains 60 whose opposite links are connected by Between-"these tiles is left sufiicientexposed space from which-thel \SCII have also indicated hollow water -'cooled cross-bars 61; the shaft, sprocket-wheels,

same diameter; and between the roll 66 and thedrawing table is a smaller roll, 67. These rolls are hollow and are cooled by air or watfi, or both, aswill be hereinafter de- Below the bending roll 65 is a transverse hollow cooling chamber, 68, provided with a water inlet'andoutlet pipes, 69. Above the cooling chamber"68 is an airsupply pipe 70 having perforations in its upper portion through which air may be directed against the face of the roll 65 immediately prior to the contact of said roll with the sheet 71 as said sheet passes from the tank to the drawing chamber.

72 are driven knurled rollers, applied to the edge of the sheet in the manner and for the purpose hereinafter set forth.

I have shown in Fig. 2 the drive mechanism for these parts so far as it is necessary in this application to show the same. 73 is the drive shaft which, by beveled gears, 74, drives the horizontal shaft 75; and other gearing (to be. hereinafter described) drives the horizontal shaft 76. This shaft 76 has upon it a worm, 77, meshing with a wormwheel, 78, on a shaft, 79, which, by means of a sprocket-chain, 80, passing over the sprocket-wheel on the shaft 79 and a sprocket-wheel, 81, on the shaft 58, drives the endless chain 60 carrying the grip-bars 61. This shaft, 76, also has upon it a worm, 82, meshing with a wormwheel 83, on the shaft 52, which drives the drawing table; and it also has upon it a worm, 84, meshing with a worm-wheel, 85, on a stub-shaft, 86, which has thereon two sprocket-wheels (not shown), one sprocket-wheel having a chain, 87, passing thereover and passing over a sprocket-wheel on the shaft which is secured to the roll 67, and the other sprocket-wheel (not shown) over which passes a chain, 88,

95 meshes with the pinion, 99, on

weapon which in the ordinarydrawing operation is loose on the shaft 53.] When the drawing table is reversed the worm-wheel 89 is clutched to the shaft 53 and the worm-wheel 83 is disconnected bya clutch from its shaft and the direction of the rotation of the shaft 76 is reversed. The two clutches for efiecting this result, 90 and 91, are adapted to be simultaneously thrown by means of a rockshaft, 92, journaled on, the side of the machine. This shaft is adapted to be rocked by a lever, 93, which at its lower end has upon it a rack, 94,- engaging with a pinion, 95, on the shaft 92 Fig. 9

To reverse the direction of the drive of the shaft 76 I employ a rocking frame, 96, (Fig. 10), journaled on a shaft, 97, adjacent to a pinion, 98, on the shaft 7 6. The pinion 97; and in the direct drive, the pinion 99 drives a pinion, 100, which in turn meshes with a gear, 101, on the shaft 7 6.

When it is desired to reverse the direction of drive the rocking frame 96 is rocked so as to disengage the pinion 100 from the gear 101, and to engage a gear, 102, with the gear 101, which gear is driven by an intermediate gear, 103, meshing with the gear 99.

The rocking of the frame 96 is efiected by-the lever 93 (Fig. 9) by means of a rackbar, 104:, engaging a pin1on,105, on a stubshaft, 106, upon which is an eccentric, 107,

(Fig. '10), engaging the rocking frame 96 to rock the frame from one position to the other. Any other form of reverse mechanism may be employed. There are two pairs of knurled rollers one for each edge of the sheet. The driving mechanism for these knurled rollers is shown in Fig. 2, 110 be ing a gear between the shaft 75 and a shaft 111. Between the shaft' 111 and a drive shaft, 112, is a variable speed gear connection, 113; the operator by suitable mechanism (not shown) being able to connect any one of the gears 1141 with the drive-gear on the shaft 11, so astogive a variable speed to the knurled rollers.

The knurled roll shafts; 115, (see Fig. 11) are geared together by gears 116, andone of the shafts has upon it a beveled gearwheel,

117, meshing with a beveled gear, 118, on the shaft 112. r

It is to be understood that a drive connection is provided from the side of the machine shown in Fig. 2 to the opposite side for the similar rolls upon such opposite side of the machine. This is obvious and need not be illustrated.

The shaft 75, (Fig. 2) by means of a sprocket-chain, 120, and horizontal shaft, 121, may be driven, and this in turn, by suitable gearing (not shown) may be used to drive the leer carrier in the leerinto which the glass sheet passes from the drawing I table, and in whlch it is gradually cooled.

the shaft These drive connections and driving mechanism in detail form no part of my present invention and 1 do not deem it necessary to further illustrate the same.

The starting of the apparatus iswell understood from 'imy previous patents. The bait, 122 (Fig. 2) being lowered upon the .drawing table and the table reversed will and as the bait advances acrossthe drawing table, the sheet will be bent over the bending roll and drawn onto the table. The bait may then be broken 0d, and the sheet of glass will pass from the drawing table into the leer, being received upon the leer carrier.

The knurled rollers will then be caused to engage the edges of the glass sheet, where they serve not only the function of maintaining the uniform width of the sheet, but also the additional functions of applying a drawing power to the edge portions of the sheet (if their speed be adjusted so as to beless than that of the drawing table), and supthrough the draft-applying apparatus, with resulting injury to the commercial value of the product. 1 have discovered that 1 can entirely eliminat these dificulties by the method of proce ure and construction of apparatus which 1 will now proceed more particularly to describe.

-1t will be understood that the sheet as a whole is drawn by reason of the advancing action ofthe drawing table and the gri bars between which bars and table the sheet is clamped. This places a tension on the sheet (as a whole) from the drawing table to the sheet-forming point adjacent the molten mass of glass. 1 have. discovered that it is desirable to apply a different ten sion to the edges of the sheet as compared with that portion of the sheet between its edges. 1 apply this additional tension to the edge portions of the sheet by driving the which will drive the same at a peripheral speed less than the speed of the drawing tank; .thatis, 1 provide a of the drawing table.

table. I find that good results are obtained when the peripheral speed of the knurled rollers 7 2 is from 10% to 20% less than that By spacing these tance apart exceeding that of the thickness of the main body of the sheet 71, a thickened or beaded edge portion 130 is formed at each edge of the sheet, as will be clearly understood by an inspection of Figs. 11 and 12.

In order to prevent the bending roll from marringv or defacing the drawn sheet, I cool j that surface of the sheet which is to come in contact with the bending roll just prior to' its contact therewith, and also supply means for cooling that'portion of the surface of thebending roll that is just about to come in contact with the glass. A suitable and effective means for this purposeis shown in the water cooler 68 located immediately adjacent to that face of the sheet 71 which is tocontactwith the bending roll, and also closely 4 adjacent ,to the under face of the bending roll-itself. Preferably, though not neces sarily, I also supply the cooling air current for action upon the surface of the roll and the surface of the sheet just prior to their contact with each other. This I accomplish by. blowing-a current of air through a pipe.

70, which pipeis provided with a longitudinally extending series of perforations for directing a cooling current of air upon the roll and the face of the sheet just before it contacts with the roll.

In addition to the surface cooling of the bending or other cooling agent. This may be accomplished, as shown'in Fig. 4 by leading the air. pipes 131 into each endof the bending by means of the pipes 132 connected with a suitable water supply, a ,suitable r gage 133 being provided to show "the amount of water entering therein; the pipe 132 having a side'connection, 134:, into the air pipe, as

shownin Fig. 5'. The air blowing through the pipe'will pick up the water as it comes and spray it intothe interior of the bending roll, .there being a suitable outlet (not' shown) atone end of the roll for the accumulating water. Inasmuch as the shee vent its bendingreadily over the bending 'roll, I apply heat to the upper portion thereof by a gas flame in the heating chamber 45 directed upon the outer surface of the sheet substantially at the bending roll, as clearly shown in Fig. 1.

As the sheet is bent from the vertical to the, horizontal over the bending roll it is materially lowered in temperature and 1f 1t knurled rollers i a disv on the drawing ta roll, I also 'cool said roll from within, preferably bymeans of a water spray lass is drawn up into an open air space an notinto a cham- .ber, to prevent it from cooling too rapidly and hardening to a degree which will preis passed immediately to the drawing table it 1s liableto have slight undulations or waves in it. To prevent the possibilit of this and to perfectly flatten the sheet 71. 6., remove or prevent the formation of said undulations or waves), ']v pass it over suitable supports between the bending roll and drawin table and re-heat it at this point to so ten it sufliciently so that it may flatten upon the drawing table. By reference to Flg. 1, it will be seen that the grip-bars do not contact with the sheet until the same has traveled for an appreciable length of time 1e, after the latter has passed'the inchne 56 on the guide 54 and therefore become perfectly level.

This re-heating of the glass in its horizontal run is accomplished by means of the flame-passing downward from an outlet slot,

125, from the chamber-37 and impinging upon the upper surface of the sheet after it hasleft the bending roll.

To enable the glass to flatten or lie perfectly smooth before the resser-bars or grip-bars grasp it I arrange the table in such relation to the grip-bars that there is a flat portion 135 (Fig.13'),'upon which the glass will have an opportunity to flatten before the grip-bars 61 contact it.

With the knurled rollers spaced far enough apart to form the beaded or thick ened edge 130 (Fig. 11), it will be apparent that the beaded or thickened portion on that side adjacent to the bending roll will be more or less flattened out, leaving an upwardly projecting thickened portion on the upper side of the ed e portions of the sheet, as clearly shown in. ig. 14. And this thickened portion will be engaged by the grip bars, leaving the middle or body portion of the sheet untouched by said grip bars, thus preventing any marring of the surface .portion of the sheet proper by the drawing apparatus. K

The intermediate supporting rolls66 and 67 and the knurled rolls 72 may be water cooled in the well-known manner.

. With this apparatus I am able to continuously produce sheet glass of good quality, clear, free from defects and flat.

.Iclaim:

1. The method of drawing sheet glass which consists in preparing a mass of molten glass, drawing a sheet of glass vertically therefrom, then bending the drawn sheet over a surface-cooled roll, applying draft tothe sheet horizontally from the bend and then annealing it.

2 The method of drawing sheet glass whlch consists in preparing a mass of molten the sheet which contacts with the roll just prlor to, its contact with the roll, advancing glass,- drawing a sheet of glass vertically therefrom, bending-the drawn sheet over a surface-cooled roll, cooling that surface of glass, drawing agenda the sheet horizontally from the bend and then annealing it.

. 3. The method of drawing sheet glass which consists in preparinga mass of molten glass, drawing a sheet of glass vertically therefrom, passing the drawn sheet vertically through a'cooling space and thence into a heated space, bending the sheet to the horizontal, raising the temperature of the horizontal run of the sheet to soften the same, and then gradually cooling the same.

4t. The method of drawing sheet glass which consists in preparing amass of molten glass, drawing a sheet of glass vertically therefrom, hardening one face of the drawn sheet, then bending the sheet over a roller with the hardened face of the sheet in contact therewith, and then advancing the sheet horizontally from said roller.

5. The method of drawing sheet glass which consists in preparing a mass of molten a sheet of glass vertically therefrom, hardening one face of the drawn 7 drawn sheet sheet by cooling, bending the sheet over a roll with the hardened face of the sheet in contact with the roll, heating the horizontal run of the sheet to soften the same, and' then gradually cooling the sheet 6. The method of drawing a continuous sheet of lass, which consists in preparing a continuing supply of molten glass, continuously drawing a sheet of glass vertically therefrom, lowering the temperature of the and cooling one face of the sheet more than the other, and then bending the drawn sheet from the'vertical to the horizontal with the. cooler surface in contact with the bending means.

7. The method of drawing a continuous sheet of glass, which consists in preparing a continuing supply of molten glass, continuously drawing a sheet of glass vertically therefrom, lowering the temperature of the drawn sheet and cooling one. face thereof more than the other, horizontal with the cooler surface in contact with the bending means, softening the horizontal run of the sheet by heat, flattening the softened sheet, and then gradually cooling the same.

& The method. of drawing sheet glass which consists in preparing a mass of molten glass, drawing a sheet lass therefrom with edge portions thicker it an the body of the sheet, reheating the drawn sheet to soften the same, flattening the softened sheet, and applying the drawing means to the thick edge portions only of the flattened sheet.

9; The method of drawing sheet glass,

which consists in preparing a mass of molten glass, drawing a sheet of glass therefrom with its edge portions thicker than the re remainder of the sheet,

partially cooling the drawn sheet, reheating to soften; the sheet, attening "the softened sheet, d appl bending the sheet to the the drawing power to the edge portions only of the flattened sheet.

. 10. The method of drawing sheet glass which consists in preparing a mass of molten glass, drawing a sheet of glass therefrom having edge portions thicker than the re mainder of the sheet, partially cooling the sheet, and applying the drawing power to the thick edge portions only of the partially cooled sheet.

11. The method of drawing sheet glasswhich consists in reparing a mass of molten glass, drawing a sheet of glass therefrom with the edge portions of the sheet cooler than the body portion thereof, and applying at or near the formative point of the edge portions of the sheet a yielding mechanical resistance to the drawing force other than the resistance due to the viscosity of the glass. r 7 s 12. The method of making sheet glass which consists in preparing a mass of molten glass, drawing a sheet of gl ss ther f m with the edges cooler than the body portion by applying a drawing action to the sheet as a whole and applying an initial drawing 'action to the edge portions of the sheet, which initial action draws the edge portions of the sheet from the molten mass at a lower rate of speed than that of the drawing action for the sheet as a whole.

13. lln a machine for drawing a continuous sheet of glass, the combinatlon of a re ceptacle containing a mass of molten glass, a drawing table, means for clamping the sheet against the table, and means for raising the temperature of the glass suficiently to cause it to flatten on the drawing table before contact with said clamping means.

14:. In an apparatus for drawing sheet glass, the combination of a receptacle .containing a mass of molten glass, a drawing table, means cooperating I therewith for drawing the glass from said molten mass in sheet form, means partially cooling the drawn sheet adjacent to its formative point, means for reheating the drawn sheet to flattening temperature prior to itsreaching the drawing table, whereby the reheated sheet is rendered plastic and flattens upon the drawing table.

15. In a sheet glass drawing mechanism, the combination of a receptacle for molten glass, an endless traveling drawing table, means for applying heat to the drawn sheet to soften the; same and cause it to flatten on the table, and means for clamping the sheet against the table after said sheet has flattened thereon;

16. In a sheet glass drawing mechanism, the combination of a receptacle containing a mass ofmoltenglass, a drawing table, means for holdingone run of said table-flat in a horizontal plane, and clamping means enthe drawn sheet after said sheet has combination of a receptacle containing a mass oi molten glass a bending roll above the same, drawing mechanism to one side of the riding roll and adapted .to draw a sheet vertically and then bend it over the roll into a horizontal plane, a pair of separated driven rolls between the bending roll and the drawing mechanism upon which rolls the sheet rests, and means directing a flame downward on the sheet when on said intermediate rolls.

18. In a sheet glass drawing mechanism, the combination .of a receptacle for molten glass, a bendingroll above the same, a drawing and flattening mechanism to one side of the bending roll and approximately in the same horizontal plane as the .top of said roll whereby said drawing mechanism draws the sheet of glass vertically from said receptacle over the bending roll and thence horizontally, a support for the sheet between the bending roll and the drawing andflattening mechanism, and means for reheating the I sheet to a flattening condition while on said o support.

19. The combination with a-receptacle for molten glass provided with a drawing opening, an inclosed drawing chamber to one side of said opening, a vertical wall on the opposite side' of said drawing opening from" said drawing chamber, a horizontal roof or wall extending over said drawing opening from said vertical wall to the drawing chamber, a combustion chamber in the upper part of the vertical wall having lateral ports directing flame outward over said drawing opening, and a combustion chamber'in the horizontal wall having-downwardly opening ports and directing flame on the horizontal run of the sheet. I

20. The. combination of an. openftopped receptacle for molten glass, an inclosed 'drawii chamber arranged to one side of sa1d eptacle, a bending ,roll vertically over said receptacle,-sheet-clamping means within said drawing chamber whereby the sheet is drawn vertically over the bending roll andthen horizontally into the drawing chamber, acombustion chamber directing flame on the upper part of the vertical portlon of said-sheet as it is drawn and a second independent combustion chamber directing flame upon the horizontal portionofsaid sheet-adjacent to thebending roll.

'21. In-iasheet glass drawing mechanism, the combination of a receptacle for molten glass, a bending roll above the, same, an inclosed' drawing mechanism to one side of the bending roll, an archover the bending roll open-to the atmosphere at its opposite ends retreats and above the bending roll, and means for heating the space beneath the arch.

22. In a sheet glass drawing mechanism,

the combination of a receptacle for molten glass, a bending roll above the same, an inclosed drawing mechanism to one slde of a the bending roll whereby the sheet may be drawn vertically, bent over the bending roll and continuously drawn horizontally, an arch above the bending roll open at its ends to the external atmosphere, means for heating the space beneath the arch at the upper end of the vertical portion of the sheet, and means for heating that portion of the arch above the horizontal run of the sheet.

23. In a sheet glass drawing apparatus, the combination of a receptacle for molten glass, a closed-top drawing chamber above and to one side of said receptacle, a bending roll, a horizontal wall above the bending roll forming a narrow horizontal passage above said roll, and means for directing a gas flame into said chamber downwardly toward the drawn sheet of glass beyond but adjacent to the bending roll.

, 24. In a sheet glass drawing apparatus,

the combination of a receptacle for molten glass, horizontally moving drawlng mechanism, a bending roll above said receptacle,

- and means for cooling the inner face of the sheet just prior to its contact with-the bending rolls 25. In "asheet glass drawing apparatus,

the combination of a receptacle for molten glass,'horizontally moving drawlng a paratus engaging the drawn sheet, a en g roll above said receptacle, and cooling means beneath the bending roll for cooling the face of the sheet which contacts with said roll and just priorto such contact.

26. In a sheet. glass drawing apparatus, the combination of a receptacle for molten glass, a bending roll above the tank, and

means exterior to the roll cooling. the ex- .terior surface of said bendin roll. V

27. In a sheet glass drawmg apparatus, the combination of a receptacle for molten glass, a bending roll above said rece tacle, and means exterior to the roll form ucing the temperature of said bending roll. 28. In a sheet lass drawing apparatus,

the combination 0 a receptacle for molten glass, a bending roll above said receptacle, means passing a cooling fluid through the roll, and a surface-coo device for coolmg the exterior surface '0 the roll.

29; In a sheet glass drawing apparatus, the comb nation 0 a receptacle for molten glass, abending roll above said receptacle,

and a fluid circulating receptacle arranged 7 adjacent to the under surface of the roll.

30. In a sheet. glass drawing apparatus, the combinat on of a receptacle for molten glass, a drawing table above the level-of the glass in said receptacle and at one side of naaaaoe the drawing point, 'a bending roll above the tank over which the drawn sheet of glass is bent in passing from the tank to the drawing table, and a cooling device arranged adj acent to the under surface of the roll and in proximity to the vertically rising sheet just before it contacts with the bending roll.

31. In a sheet glass drawing apparatus, the combination of a hollow bending roll, and means for passing an air current therethrough and for spraying water therethrough.

32. In a sheet glass drawing apparatus, the combination of a hollow bending roll, and means for cooling the same comprising an air jet discharging into the roll and means for feeding water into. the air jet whereby said air jet sprays the water into the roll and cools the same.

33. In a sheet glass drawing apparatus,

the combination of means for drawlng a sheet of glass, a hollow bending roll, a hollow chamber beneath and adjacent to the roll, means for circulating water through said chamber, and means for directing a cooling air current on the exterior surface of the roll adjacent the water cooler.

34.-In a sheet glass drawing apparatus, the combination of a receptacle for molten glass, a drawing table, a bending roll over which the drawn sheet passes from the tank to thedrawing table, and means for supplying air for cooling purposes to said roll and sheet just before they contact with each other.

35. In a sheet glass drawing the combination of a receptacle for molten glass, a bending roll, means for drawing a sheet of glass vertically from said receptacle over said roll and then horizontally, a drawing table receiving said drawn sheet after it leaves said roll, and means simultaneously cooling the exterior surface of the roll and the face of the sheet adjacent said roll just prior to the contact of said face and roll.

36. In a sheet glass drawing apparatus, the combination of a receptacle for molten glass, means for drawing a sheet of glass therefrom, a roll over which the sheet of glass passes as drawn, and means for simultaneously cooling the exterior surface of the roll and the contacting face of the sheet just previous to the contact between said sheet and roll.

In testimony whereof I afiix my signature in presence of two witnesses.

IRVING W. COLlBIIRN. Witnesses:

JAMES N ANGUS, JOSEPH P; CROWLEY.

apparatus, 

